The locust locust is damaging on the litchi anniversary. When it is not on the fruit, it mainly damages young shoots, young leaves, and flower spikes, and drills the near stem tip and young leaf midrib. The damaged leaves later showed a brownish midrib, with the epidermis broken; when the spikes or shoots were injured, the tip died, but it was often not noticeable. The period of flowering and fruiting is when the number of insects rises sharply and the damage is severe. Young fruits eat fruit nucleus during the expansion period, resulting in fruit drop. After the fruit develops to coloring, it mainly feeds on the stem of the fruit pedicel, leaving the worm in the pedicle, which not only affects the fruit development, but also results in pre-harvest fruit drop. The more serious is the impact on quality, resulting in a substantial reduction in income. Therefore, controlling fruit locusts during the fruiting period is the key to guaranteeing bumper harvests and obtaining benefits. The locusts occur in the Guangdong region every year for 10-12 generations. The fruiting period is the period when the locust growth and development conditions are most suitable, occur in the largest number, and result in the most serious losses. The egg period is 2 to 2.5 days, the larval period is 7 to 8 days, the flood period is 7 to 9 days, and the pre-spawning period is about 4 days. One generation is about 20 days. Adult moths are small moths. Their flying power is not strong. During the day, they often rest on the branches inside the canopy. If they are disturbed, they will fly for a short time and then rest in the original tree. Few will fly. Usually in the early morning, at the end of the evening, eggs are spawned at one time. Eggs are scattered among the fissures of the litchi fruits. The eggs are often found in the lower part of the young fruit or the fruit pedicles of the mature and mature fruits. The larvae hatch from the eggs after hatching. The underside of the shell directly enters the host. When the seedlings are in a liquid cavity (ie, before the second physiological fruit drop), the larvae do not feed on the seed nucleus; in the fruit enlargement period, when the white solids are formed in the cavity, the nucleus cotyledon is eaten by the fruit. The seed nucleus is hard (close to maturity) and the stem (ie, pedicle) is taken. After the mature larvae have detached from the fruits, they are spun on the ears, leaves, ground weeds or deciduous leaves. According to the above characteristics, the following measures should be taken to prevent locusts from lychee during the fruiting period: 1. During the second peak of physiological fruiting, the prediction of the occurrence period begins. Mainly through inspection, to control the emergence of each generation of adults when the emergence of 40% -80% spraying, the main killing adults and newly hatched larvae; about 40 days before fruit picking check the amount of eggs on the fruit, in the presence of eggs Spraying should be controlled at 1%; in addition, spray should be applied 20 days and 10 days before fruit harvest. 2. Before the peak of the second physiological fruit drop and after fruit picking, generally do not spray freely, mainly through measures such as rectification and release, control of winter shoots, short cut spikes and other measures to control the increase of insect sources. Protect natural enemies, such as parasitic bees and ants, to control their number. 3. The selected drug should have strong contact and penetration properties to kill adult worms and young larvae. The agents for selection are: Lancet (40% EC) 1000-1500 times, Pterodactyl (55% EC) 1500 times, Ari Bao (4.5% EC) 1000-1500 times, strong Lei (25% EC) 1500 times. When spraying, pay attention to the dry litchi and fruit on the canopy.
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